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https://issues.apache.org/jira/browse/KAFKA-13641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17487433#comment-17487433
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Matthias J. Sax commented on KAFKA-13641:
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I don't have a good intuition atm what a good way forward would be. However,
(to be frank) I don't consider it a too pressing issue. Furthermore, we did
accumulate multiple issues in the DSL that are not easy to be fixed, and I
personally believe that we will need to do a full "redesign" of the DSL and
ship a DSLv2 at some point – this might be the best opportunity to re-consider
this question as we won't need to worry about backward compatibility. However,
there is no timeline for a DSLv2 right now.
> Kafka Streams Scala: Add `Option` to `ValueJoiner` parameters
> -------------------------------------------------------------
>
> Key: KAFKA-13641
> URL: https://issues.apache.org/jira/browse/KAFKA-13641
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Mohammad Yousuf Minhaj Zia
> Priority: Minor
>
> Since `ValueJoiner` right parameter in `leftJoins`, `outerJoins` can be
> nullable, I am wondering if can wrap them around Scala `Option`.
> However, there is also the concern that the left hand side value can be null
> in the case of tombstone messages, in which the `Option` semantics can be
> misleading. I still feel this could be a useful feature in reducing the
> number of `NullPointerExceptions`.
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